As filed with the Securities and Exchange Commission on August 29, 2025
Registration No. 333-271793
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Post-Effective Amendment No. 1 to Form S-3 Registration Statement No. 333-271793
FORM S-3
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933
ITEOS THERAPEUTICS, INC.
(Exact Name of Registrant as Specified in Its Charter)
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Delaware
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84-3365066
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(State or Other Jurisdiction of
Incorporation or Organization)
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(IRS Employer
Identification No.)
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321 Arsenal Street
Watertown, Massachusetts 02472
(Address of Principal Executive Offices, including Zip Code)
Michael Hearne
Chief Financial Officer
iTeos Therapeutics, Inc.
4747 Executive Drive, Suite 210
San Diego, California 92121
(858) 281-5372
(Name, Address and Telephone Number, including Area Code, of Agent for Service)
Copies to:
Ryan A. Murr
Gibson, Dunn & Crutcher LLP
One Embarcadero Center Suite 2600
San Francisco, California 94111
(415) 393-8200
William Michener
Nicholas Roper
Ropes & Gray LLP
800 Boylston Street
Boston, MA 02199
(617) 951-7000
(Name, address, and telephone number, including area code, of agent for service)
Approximate date of commencement of proposed sale to the public: Not applicable.
If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐
If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in
connection with dividend or interest reinvestment plans, check the following box. ☒
If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration
statement number of the earlier effective registration statement for the same offering. ☐
If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. ☐
If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e)
under the Securities Act, check the following box. ☐
If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant
to Rule 431(b) under the Securities Act, check the following box. ☐
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the
definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):
Large accelerated filer
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Accelerated filer
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Non-accelerated filer
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Smaller reporting company
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Emerging growth company
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DEREGISTRATION OF SECURITIES
This Post-Effective Amendment (the “Post-Effective Amendment”) filed by iTeos Therapeutics, Inc., a Delaware corporation (the “Registrant”), relates to the following Registration Statement on Form S-3 (the “Registration Statement”):
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Registration Statement No. 333-271793, registering: (i) a base prospectus, which covers the offering, issuance and sale by the Registrant of
the Registrant’s common stock, preferred stock, warrants and/or units from time to time in one or more offerings with a total value of up to $300,000,000; and (ii) the sale of up to $125,000,000 of common stock offered by the Registrant
under a sales agreement with Cowen and Company, LLC, which was filed with the Securities and Exchange Commission on May 10, 2023.
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On July 18, 2025, the Registrant entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Concentra Biosciences, LLC, a Delaware limited liability company (“Parent”), and Concentra Merger Sub VIII, Inc., a Delaware
corporation and wholly owned subsidiary of Parent (“Merger Sub”). Pursuant to the Merger Agreement, on August 29, 2025, Merger Sub was merged with and into the Registrant with the Registrant surviving as a wholly owned subsidiary of Parent
(the “Merger”). In the Merger, each share of Common Stock (the “Shares”) (other than (i) Shares owned or held in the Company’s treasury immediately prior to the Effective Time, (ii) Shares owned directly or indirectly by Parent or
Merger Sub immediately prior to the Effective Time and (iii) Shares held by any stockholder of the Registrant who properly exercised appraisal rights under Delaware law) was converted into the right to receive (i) $10.047 per Share in cash and (ii)
one non-transferable contractual contingent value right for each Share.
As a result of the Merger, the Registrant has terminated all offerings of its securities pursuant to the Registration Statement. In accordance with an undertaking made by the Registrant in the Registration Statement to remove from registration, by
means of a post-effective amendment, any of the securities that had been registered for issuance that remain unsold at the termination of the offerings, the Registrant hereby removes from registration all such securities registered under the
Registration Statement that remain unsold as of the date hereof and terminates the effectiveness of the Registration Statement.
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for
filing this Post-Effective Amendment to the Registration Statement and has duly caused this Post-Effective Amendment to the Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Diego,
State of California, on August 29, 2025. No other person is required to sign this Post-Effective Amendment to the Registration Statement in reliance on Rule 478 of the Securities Act of 1933, as amended.
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ITEOS THERAPEUTICS, INC.
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By: /s/ Michael Hearne
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Name: Michael Hearne
Title: Chief Financial Officer
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